When teeth lose their enamel and become yellower due the accumulated effects of food, tea, coffee, and tobacco, what type of aging is occurring?

Which of the following was one of the four humors studied by Hippocrates?

a) urine b) saliva c) pus d) phlegm

The social or environmental setting of a person's behavior is referred to as _________

a) the situational context b) the historical context c) the cohort effect d) societal norms